Background: Neurologically, it is proven that stimulation of larger diameter fibers - e.g. using appropriate coldness,\r\nwarmth, rubbing, pressure or vibration- can close the neural ââ?¬Å?gateââ?¬Â so that the central perception of itch and pain\r\nis reduced. This fact is based upon ââ?¬Å?Gate-controlââ?¬Â theory of Melzack and Wall.\r\nPresentation of the hypothesis: Syringe Micro Vibrator is a new design being introduced for the first time in the\r\nfield of Dentistry. This device is a promising breakthrough in pain and anxiety management and may deliver\r\nsolution for clinicians plagued with patient pain phobia. It has an off-set rotating micro vibration creator with ultra\r\nhigh frequency and ultra low altitude that can be easily placed on any standard dental syringe and some\r\ndisposable syringes. This device was registered as an invention in dentistry and received Iran National Patent\r\nnumber of 63765.\r\nTesting the hypothesis: By creating micro vibration, this device would be effective in reducing the pain and\r\nanxiety confronted with most types of intraoral injections as palatal, mandibular block, intraligamental and local\r\ninfiltration. From the aspect of the patient pain management, this device contributes both physiologically (based\r\non Gate Control Theory of pain) and psychologically (based on the device function as will be explained by dentist\r\nto the patient as a modern pain reducing technology). From the aspect of clinician, SMV motor provides vibrations\r\nwith ultra high frequency to alleviate pain, but since it has ultra low vibration altitude, it has no adverse effect on\r\nthe clinician dexterity and accuracy during injection and it does not interfere with pin point localization of\r\ninjection site.\r\nImplications of the hypothesis: Upon mounting on a conventional dental anesthesia injection syringe, SMV is\r\nswitched on and the clinician then uses normal injection technique to administer the anesthetic. This device is not\r\nonly a useful accessory device for ordinary patients, but also more useful for pediatric patients and those who have\r\na phobia of intraoral injection or pain
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